In http://www.AncientSocieties.com/convo/ in the 6th line, the last symbol should be Olmec (gold)
In http://Endgame-ARG.Wikia.com/wiki/Pressure the third letter of the theme keyword "escape" was spelled "esdape", so that you were thrown way off if you recognized the presence of the theme word right away. (This is where I realized they're purposely trying to avoid making it too easy.)
In http://www.AncientSocieties.com/anthropology/ the "Still Waters" clue implied antipodes, but instead you had to use the Longitude values that were an equal distance from the Prime Meridian in the opposite direction (the negated value).
I don't think we ever determined what the intended path to solve http://www.AncientSocieties.com/again/ was, but based on using the same technique throughout each line, you'd think each line in the last group would be the same as the corresponding lines in the first group, with "255 217 0" appended to each line, so maybe the middle part of the last line should have been "0 85 168" rather than "236 0 0". (The answer "camouflage" was found via Saturday's challenge and "camo" via back solving.)
In http://www.AncientSocieties.com/crib/ some of the paint stripes on the caboose probably did not end where they should have.
In http://www.ancientsocieties.com/dam-tour/ the lines had 14, 21, 26, 32 and 38 positions but should have been double the number of characters in the answers which were 7, 10, 13, 17 and 20. The lines with double digit numbers (2nd, 4th and 5th) were off.
In http://Endgame-ARG.Wikia.com/wiki/Blueprint the second line 127.313 + 323.992 adds up to 451.305 but the result should be 415.305 instead (was later fixed)
In http://www.AncientSocieties.com/privacy-window/ you had to use the misspelled version of "straitjacket" ("Straight Jacket") to get the last character "H".
This appears to be unintended, since "stl.la/straightjacket" does not work.
In http://www.AncientSocieties.com/fireplace/ the colors should have continued with: Yellow Red Orange Blue Yellow Blue Purple Red
In http://www.AncientSocieties.com/in-circles/ the text clue suggests reading down the columns first, but instead you have to go in normal reading order for Americans and Europeans, left to right then top to bottom.
In http://www.AncientSocieties.com/gaff/ the fourth line of the last group should read d) (7.5,3.5) -> (4.5,3.5) F.
In http://endgame-arg.wikia.com/wiki/Wall_of_Fame the text for the last picture eliminates all of the letters. Instead of "-Six each muscle", it should be "-Musicals exec".
In http://endgame-arg.wikia.com/wiki/PIllows, the first "+" should be "-", making it "[AcCUSe - (-HIS + SICKNeSS)]84+53+16+8+7 - 53+8+7+16". And on the solution page, the math was wrong:
AcCUSe = 89 + 6 + 92 + 34 = 221
HIS = 1 + 53 + 16 = 81 - should be 70
SiCKNeSS = 14 + 6 + 19 + 10 + 16 + 16 = 70 - should be 81
Things from http://www.Amazon.com/The-Rebel-Essay-Man-Revolt/dp/0679733841 that don't work:
stl.la/[the]rebel - of course
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